What was found
ON CLIMBOUT AND AT FL 360 LT AND RT DUCT PRESSURE SPLIT BY 20 PSI. LT READS 45 PSI RT 25 PSI. ACFT GROUNDED. WHILE ACCOMPLISHING TASK CARD NG-36WC-00001 NR 2 ENGINE BLEED AIR SYS HEALTH CHECK, FOUND PRECOOLER CONTROL VALVE FAILED STEP F. (5), FAILED TO MOVE FULLY OPEN OR WITHIN 30 DEGREES OF FULLY OPEN WHEN PC IS 3 PSIG OR GREATER. R & R PCV REF AMM 36-12-02-400-801 AND PERFORMED INSTALLATION TEST AMM 36-12-02-400-801, STEP G. TEST PASSED. PERFORMED ENGINE BLEED AIR CROSSOVER OPS TEST REF AMM 36-11-00-710-801 AS REPAIR CONFORMATION. TEST PASSED.